$46r+44+17r+13-24$
$\frac{-x^3-x^2+3x+2}{x-2}$
$\int cos^2\left(\frac{x}{4}\right)dx$
$\frac{dy}{dx}\left(\sqrt{x^2+y^2}=xy\right)$
$\cot\:^2\left(x\right)\left(1-cos2x\right)+2sen^2x=2$
$2y-28=54$
$x^2y'+xy=-8$
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